When there are apps in the dock, dragged 'n dropped from the File Viewer, and then trying to quit/logout from GWorkspace, gworkspace hangs, and makes it unable to quit the application in a "normal" way. This happens on OpenSUSE 11.3 x86_64 and on OpenBSD i386.
On both systems, installed GWorkspace from svn, but together with latest versions of gnustep-core stable, which are:
make 2.4.0
base: 1.20.2
gui/back: 0.18.0
cairo backend.

attaching gdb, and setting a breakpoint on -[NSException raise], and then trying to quit GWorkspace, I see it stopping there, with the following backtrace: